My motor went dead after a while, so I posted a topic to this forum. MBDOC told me to check the ignition switch, and when I took it off, sure enough, it was the culprit. It makes sense that after a million turns, the contacts on those switches wear out. Well, I've replaced it and my motor is blowing fine again. Maybe you should look at that.

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89 300CE
91 Supercharged Miata
99 E320 Wagon